| Here are seven conifer winged seeds, all collected from Bull Run Basin, Nevada, from the upper Eocene Chicken Creek Formation. For reference, the winged seed in the center is 10 millimeters in actual length. At lower right is an unspecified fir winged seed; at the upper left is a winged seed from an unspecified variety of pine. The remainder of the specimens belong to a species of spruce called scientifically Picea coloradensis, a fossil variety that shows affinities to both the modern Colorado Blue spruce and the Engelmann spruce. |